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24 Oct 2017, 16:23

All of John's friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.

If the statements in the passage are true, then which one of the following must also be true?

This is a must be true/ inference questions and thus, all statements in the argument are premises.

(A) Smokers often lie about how much they smoke. - This can't be inferred from the argumentB) People often knowingly exaggerate without intending to lie. - There is no indication of exaggerating without intent.(C) All John's friends know the same lifelong heavy smoker. - John said he knew none. John's friends claimed they all knew someone who fell in the category. Nowhere is it mentioned that they knew the same person. (D) Most of John's friends are not telling the truth. - Since, John claims that he knows no smoker and since he is not unique in holding this view point, it can be inferred that some of his friends are lying but we have nothing to state that a majority of his friends are lying. Even 1 person lying will be consistent with the argument.(E) Some of John's friends are not telling the truth. - Yes. This can be reasonably inferred. If John claims he knows no smoker and he is not unique to this view then this means that atleast one of his friends also does not know any smoker and he/ she is lying. So, we can say that some of his friends are lying. All the other friends might know someone who smoke. Correct.

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